Use our I130 affidavit sample and tips to create a strong affidavit for your spouse. Include these key points and avoid common mistakes.Use the sample I751 affidavit as an example. Remember that each letter is unique and should contain elements that are personal to your story. Customize and Download this "Utah General Affidavit". How Do You Write an Affidavit of Marriage? Both Fiances must provide this letter stating an "understanding" that marriage must occur quickly after arrive in the US on the K-1 Visa. (UT). Immigration. I know this is probably outside the scope of this sub but a group of my friends are at a complete loss. If everything is accurate, you and your spouse sign the affidavit together and in the presence of a notary public. This is mandatory to constitute an affidavit.